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    <title>Document</title>
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    <script>
      //1. 参数问题
      // 1.1 放入两个参数
      const sum = (num1, num2) => {
        return num1 + num2;
      };

      // 1.2 放入一个参数(可以省略小括号)
      const power = (num) => {
        return num * num;
      };

      // 2.函数中
      // 2.1 函数代码块中有多行代码
      const test = () => {
        // 1. 打印Hello World
        console.log("Hello World");

        //2. 打印Hello Vuejs
        console.log("Hello Vuejs");
      };

      // 2.2 函数代码块中只有一行代码
      // const mul = (num1, num2) => {
      //   return num1 + num2
      // }

      const mul = (num1, num2) => num1 * num2;
      console.log(mul(1, 3));

      // const demo = () => {
      //   console.log('Hello demo');
      // }

      const demo = () => console.log("Hello demo");
    </script>
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